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Abstract

In small data-processing systems it is generally desirable to accomplish a maximum number of functions with a minimum of hardware, using a limited number of separate logic building block types.

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United States

Language

English (United States)

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Increased Utilization of Instruction Counter

In small data-processing systems it is generally desirable to accomplish a
maximum number of functions with a minimum of hardware, using a limited
number of separate logic building block types.

The data flow shown is typical for small processing units. Three registers, Q
register 18, A register 20 and instruction counter 22 are included in data flow for
arithmetic operations and instruction sequencing. Q register 18 is connected for
an internal shift right which is required for multiply. A register 20 is connected to
shift left internally as required for left shift instructions and for division.

Instruction counter 22 is normally not required to shift, even though the same
logic building block is used for the instruction counter as for A Register 20 and Q
register 18 which has an internal shift capability.

The internal shift capability of the instruction counter 22 is
used to perform left shift operations, so that a quotient is
accumulated in the instruction counter 22 during division operations.
Upon completion of the divide instruction, the quotient is removed
from instruction counter 22 and the instruction counter is restored
with its original instruction count information from storage. This
is achieved by storing the contents of instruction counter 22 in
storage prior to the execution of a divide instruction, executing the
divide instruction, and generating a pseudointerrupt to store the
divide answer in storage an...